HYDRAULIC INDICATING SYSTEM -INTRODUCTION
EFFECTIVITY BEJ ALL PRE SB 777-29-0024 29-30-00
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HYDRAULIC INDICATING SYSTEM -INTRODUCTION
EFFECTIVITY BEJ ALL POST SB 777-29-0024 29-30-00
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777 AIRCRAFT MAINTENANCE MANUAL
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29-30-00
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HYDRAULIC INDICATING SYSTEM -PUMP AND RESERVOIR SENSORS -COMPONENT LOCATIONS
Pump Sensors
Each pump has two transducers:
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One pressure transducer
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One temperature transducer.
These transducers are on or near the ACMP, ADP, and EDP filter modules. The pressure transducers are in the pressure line and the temperature transducers are in the case drain line.
Each ACMP has one temperature switch:
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The ACMP temperature switch is a part of the pump.
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The temperature switch closes at 105 degrees C and reopens at 75 degrees C.
BEJ ALL PRE SB 777-29-0024
* The temperature switch is not used.
BEJ ALL POST SB 777-29-0024
* The temperature switch provides an overheat signal that is independent of the temperature transducer.
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Reservoir Sensors
Each reservoir has these sensors:
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Reservoir quantity transmitter
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Reservoir temperature transducer
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Reservoir pressure switch.
The reservoir quantity transmitters are in each hydraulic reservoir.
The reservoir temperature transducers are on each hydraulic reservoir.
The reservoir pressure switches are on the pneumatic lines to each reservoir.
Training Information Point
All the pump temperature transducers are interchangeable.
The pump pressure transducers are interchangeable with each other and are also interchangeable with the system pressure transducers.
The left and right quantity transmitters are interchangeable. The center system quantity transmitter is different from the left and right system quantity transmitters.
The reservoir temperature transducers are interchangeable. The reservoir pressure switches are interchangeable.
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HYDRAULIC INDICATING SYSTEM -PUMP AND RESERVOIR SENSORS -COMPONENT LOCATIONS
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HYDRAULIC INDICATING SYSTEM -HYDRAULIC SYSTEM PRESSURE TRANSDUCER -COMPONENT LOCATIONS
General
The left and right hydraulic system pressure transducers are on the rear wing spar of the left and right wings.
The center system pressure transducer is near the keelbeam in the right wheel well.
Training Information Point
The hydraulic system pressure transducers are interchangeable with the pump pressure transducers.
Access panels (552LB -left system, 652LB -right system) on the bottom of the wings give access to the pressure transducers.
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HYDRAULIC INDICATING SYSTEM -HYDRAULIC SYSTEM PRESSURE TRANSDUCER -COMPONENT LOCATIONS
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HYDRAULIC INDICATING SYSTEM -PRESSURE INDICATING
General
These sensors in the hydraulic systems send hydraulic pressure data to the HYDIM cards:
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System pressure transducer (3)
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Pump pressure transducer (8)
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Reservoir pressure switches (3).
The HYDIM cards control the pressure indications.
Functional Description
The pressure transducers send signals in proportion to pressure between 0 and 4000 psi. The transducers make allowance for temperature changes.
The reservoir pressure switches send a reservoir low pressure signal when the reservoir pressure is 21 psia or less. They send a reservoir not low signal when reservoir pressure is 25 psia or more.
Hydraulic System Pressure Indications
Hydraulic system pressure shows on these displays:
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The status display
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The hydraulic synoptic display
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The hydraulic maintenance page.
For more information about the hydraulic system displays, see . 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：777 AMM 飞机维护手册 液压 Hydraulic Power(27)
